166922993 has 2 divisors, whose sum is σ = 166922994. Its totient is φ = 166922992.

The previous prime is 166922989. The next prime is 166923011. The reversal of 166922993 is 399229661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120846049 + 46076944 = 10993^2 + 6788^2 .

It is an emirp because it is prime and its reverse (399229661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 166922993 - 2² = 166922989 is a prime.

It is not a weakly prime, because it can be changed into another prime (166922963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 83461496 + 83461497.

It is an arithmetic number, because the mean of its divisors is an integer number (83461497).

Almost surely, 2^166922993 is an apocalyptic number.

It is an amenable number.

166922993 is a deficient number, since it is larger than the sum of its proper divisors (1).

166922993 is an equidigital number, since it uses as much as digits as its factorization.

166922993 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 314928, while the sum is 47.

The square root of 166922993 is about 12919.8681494820. The cubic root of 166922993 is about 550.6031872760.

The spelling of 166922993 in words is "one hundred sixty-six million, nine hundred twenty-two thousand, nine hundred ninety-three".